What is CVE-2023-49208?

CVE-2023-49208 is a critical-severity vulnerability in Glewlwyd Sso Server Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2023-11-23.

How severe is CVE-2023-49208?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Glewlwyd Sso Server Project

CVE-2023-49208

scheme/webauthn.c in Glewlwyd SSO server before 2.7.6 has a possible buffer overflow during FIDO2 credentials validation in webauthn registration.

Vulnerability class: Buffer Overflow

Published 2023-11-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (57.6th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Glewlwyd Sso Server Project

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

github.com/babelouest/glewlwyd/commit/f9d8c06aae8dfe17e761b18b577ff169e059e812 (Patch)
github.com/babelouest/glewlwyd/releases/tag/v2.7.6 (Patch, Release Notes)

Frequently asked questions

What is CVE-2023-49208?: CVE-2023-49208 is a critical-severity vulnerability in Glewlwyd Sso Server Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2023-11-23.
How severe is CVE-2023-49208?: Critical severity. CVSS v3 base score is 9.8 out of 10.